I've successfully narrowed down the cause of this, and found a workaround - for my systems. I'm unsure if this will fix things for anyone else, however. I did find some items surprising here, and they may warrant a deeper look.
This all came down to USB HID mouse sampling rates. The logitech reports a bInterval of 1, which is 1000Mhz. For whatever reason (this is likely a bug, I would imagine?) compiz appears to be doing work on every mouse poll. 1000 times/sec = you get stuttering going on. At least in my case. I also noticed throughout this that my Nvidia card was on APIC interrupts - while this did not end up being the root cause, it's certainly not good. Check that out as well perhaps, fix is: options nvidia-current NVreg_EnableMSI=1 in /etc/modprobe.d/nvidia.conf For now, my workaround on the performance issue is to simply limit mouse polling to something sane. This is done by creating a file (anything will do really) in /etc/modprobe.d/usbhid.conf Add: options usbhid mousepoll=10 - this is 125mhz, next up is 8, 6, 4, 2, and so on. Go with the lowest you enjoy - honestly I'm fine personally with 10 or 8. I do wonder how many laptops (as reported here) utilize USB-based trackpads? I would imagine this would contribute to quite a bit of battery drain in some use cases. Good howto is here for further reading: http://wiki.quakeworld.nu/Howto_customise_mouse_polling_rate I can't imagine there is much benefit to compiz attempting to render frames (or otherwise "do stuff") faster than a certain fail-safe. At least there should be a configured maximum somewhere - as I don't think 1000 frames/second is truly needed for my desktop window redraws :) I would imagine this bug exhibits itself more on nvidia hardware, due to needing vsync turned off as well, but that's rampant speculation. Hopefully this helps someone out there! -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/764330 Title: Move window annoying slow with compiz To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/compiz/+bug/764330/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
